Black lines on Canon 600D

[Azryulens]

 So there's this black line that almost look like a hair in my lenses, i recently dropped it to the ground, but i think its okay. then i unmounted the lens. at the lens group, i see some kind of hair and after a while its gone but somehow the black lines is still there. (when im taking picture on 35-55 mm range) (i used the kit lens). like i swear it was there before ,now its gone but somehow the picture im taking still has black lines when im using it at 35-55mm 

[Azryulens]

could this be a crack in my lens because i dropped it?

[Peter · Accepted solution]

Probably hair on the sensor.

[Azryulens]

thanks a lot, im still pretty new at this thing, just bought my first camera (600D) last week and there is some hair in the sensor!

[Anonymous]

You could remove the lens from the camera and put the camera in mirror cleaning mode. Pointing the camera with lens opening facing down, use a rocket blower and blow straight up into the opening, being careful not to touch anything inside the camera with the blower. You might be able to blow the hair off of the sensor this way. Don't use canned air for this.